//ToDo 区间
fun main() {
/*    for(i in 2 downTo 0){
        println(i)
    }*/
    //比较对象地址
    val name: String = "aaa"
    val name2: String = "aaa"
    println(name === name2)
//比较值本身
    var number1: Int? = 10
    var number2: Int? = 10
    println(number1 == number2)
}

